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2у²-5ху х у
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Х²-4у² 2у-х х+2у

2у^2–5ху х у----------------- + --------- – ------- =(х-2у)(х+2у) х–2у х+2у 2у^2–5ху+х(х+2у)–у(х–2у)= --------------------------------------- = (х–2у)(х+2у) 2у^2–5ху+х^2+2ху–ху+2у^2= ------------------------------------------- = (х–2у)(х+2у) х^2–4ху+2у^2 = ---------------------- (х–2у)(х+2у)